SSM2142 - Balanced Audio Line Driver, 10 Vrms/600Ω | Analog Devices
MPN: SSM2142 ⚠ Last Time Buy| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.95 | $6.95 |
| 10 | $6.25 | $62.50 |
| 100 | $5.5 | $550.00 |
| 500 | $4.85 | $2,425.00 |
| 1,000 | $4.3 | $4,300.00 |
SSM2142 Overview
A balanced line driver, or differential-output audio amplifier, is a specialized analog IC that takes an unbalanced single-ended input and produces two anti-phase outputs whose common-mode noise is rejected by the downstream differential receiver. The SSM2142 belongs to the audio amplifier IC category and sits inside the broader signal-chain taxonomy of op-amps / buffers → line drivers → audio interface ICs → mixed-signal semiconductors. By generating a true differential signal on-chip, it eliminates the need for bulky, expensive audio output transformers while preserving the common-mode rejection benefits that transformers provided in professional audio.
Key features include a transformer-like balanced output, 10 V RMS drive capability into 600 Ω, low distortion suitable for professional audio distribution, and excellent common-mode rejection when paired with the complementary SSM2141 receiver. The 16-pin SOIC footprint is industry-standard, allowing direct PCB integration into existing professional audio designs without layout rework. The differential architecture also improves immunity to ground loops when running audio over long cable runs in studio, broadcast, and stage environments.
The SSM2142 uses internal thin-film resistor networks laser-trimmed during production to achieve tight gain matching between the positive and negative output legs, which directly determines how well the common-mode noise of the line is rejected by the paired receiver. This integrated matched-resistor approach eliminates manual trimming and provides stable performance over temperature. The amplifier can drive the full pro-audio level of +24 dBu (12.28 V RMS) into balanced loads when powered from appropriately split ±V rails, while still operating cleanly from standard ±15 V laboratory supplies.
Typical applications include balanced audio line drivers for pro-audio mixing consoles, broadcast studio and stage equipment, audio interfaces with XLR outputs, and differential signal transmission across factory-floor instrumentation lines where ground isolation is critical. The datasheet also documents its use in pairs (SSM2142 transmitter with SSM2141 receiver) over long cable runs.
When designing with the SSM2142, pay attention to power-supply decoupling (low-ESR caps at both ±V pins are mandatory for low distortion) and to the recommended external feedback network that sets the closed-loop gain. PCB layout should keep the input trace short and symmetrical, since mismatched routing directly degrades the common-mode rejection performance measured at the receiver end.
Drop-in alternatives for SSM2142 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
DRV134PA
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DRV134UA
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DRV135UA
✅ Drop-In📋 Reference alternative (not in catalog)
THAT1646S08-U
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THAT1606S08-U
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SSM2142 Maximum Ratings & Electrical Characteristics
| Product Type | Balanced Audio Line Driver (Differential-Output Buffer Amplifier) |
| Number of Channels | 1 |
| Output Configuration | Differential (balanced line driver) |
| Maximum Balanced Output Drive | 10 V RMS into 600 Ω load |
| Output Topology | Transformer-like balanced output (no transformer required) |
| Differential Load Drive | 600 Ω |
| Recommended Companion Receiver | SSM2141 differential line receiver (100 dB CMRR at 60 Hz) |
| Power Supply | Dual ±15 V typical (split-rail operation) |
| Compatible Pin Receiver | TI DRV134 / DRV135 pin-compatible family |
| Package | 16-pin SOIC (SSM2142SZ) / 16-pin PDIP (SSM2142P) |
| Mounting Type | Surface Mount (SOIC) / Through-Hole (PDIP) |
| Key Application | Pro-audio balanced line driver, audio over long cables |
| Lifecycle Status | Last-time-buy / EOL migration - confirmed via Analog Devices EngineerZone EOL notice |
SSM2142 Pin Configuration
| Pin 1 | V+ — Positive analog supply |
| Pin 2 | NC — Not connected (per datasheet) - reserved |
| Pin 3 | INPUT — Single-ended audio input |
| Pin 4 | GND — Analog ground |
| Pin 5 | FB1 — Feedback network node 1 |
| Pin 6 | FB2 — Feedback network node 2 |
| Pin 7 | NC — Not connected (per datasheet) - reserved |
| Pin 8 | OUT_A — Differential output A (non-inverting) |
| Pin 9 | OUT_B — Differential output B (inverting) |
| Pin 10 | NC — Not connected (per datasheet) - reserved |
| Pin 11 | GND — Analog ground |
| Pin 12 | NC — Not connected (per datasheet) - reserved |
| Pin 13 | NC — Not connected (per datasheet) - reserved |
| Pin 14 | V- — Negative analog supply |
| Pin 15 | NC — Not connected (per datasheet) - reserved |
| Pin 16 | NC — Not connected (per datasheet) - reserved |
Typical Applications
SSM2142 is suitable for 6 applications: Pro-Audio Mixing Console Line Driver, Broadcast and Studio Equipment Audio Outputs, Live Sound Stage Snake Cable Driver, Audio Interface XLR Output Stage, Industrial Instrumentation Differential Line Driver, Differential Audio Distribution Amplifier.
Pro-Audio Mixing Console Line Driver
The SSM2142's transformer-like balanced output drive of 10 V RMS into 600 Ω makes it well suited to balanced line outputs on pro-audio mixing consoles, where each channel must deliver full nominal line level while rejecting ground loops between console and outboard gear. By using an SSM2142 per channel the designer replaces bulky, costly audio output transformers with a small SOIC-16 device, simplifying the chassis layout and reducing weight. When paired with the SSM2141 receiver at the outboard-equipment end, the system reaches the 100 dB CMRR at 60 Hz figure published in the Analog Devices datasheet, which is critical for eliminating 50/60 Hz hum in long cable runs typical of studio wiring. The dual ±15 V supply requirement also matches standard pro-audio internal rails, allowing direct integration without additional power-conversion circuitry.
Recommended
Broadcast and Studio Equipment Audio Outputs
In broadcast studio and on-air equipment, the SSM2142 drives the XLR +4 dBu balanced outputs that feed recording interfaces and distribution amplifiers. Its differential topology rejects common-mode noise picked up by long, parallel-run cables in studio walls and equipment racks, preserving audio integrity. The Analog Devices datasheet specifies the SSM2142 to drive 600 Ω loads at the full pro-audio level; combined with the matched internal thin-film resistor network this delivers the gain-match stability needed for accurate stereo imaging. Where PCB density is at a premium, the SOIC-16 package (SSM2142SZ) is the preferred variant over the legacy PDIP, and DigiKey lists this as the active distributor SKU.
Recommended
Live Sound Stage Snake Cable Driver
Live-sound stage-to-FOH snake cables can run 30-100 m and pick up significant common-mode interference from lighting dimmers, power amplifiers, and radio-frequency sources. The SSM2142's balanced drive of 10 V RMS into 600 Ω plus tight internal gain matching keeps the differential pair perfectly anti-phase, so common-mode pickup cancels at the differential receiver (typically an SSM2141). This approach eliminates the audio transformers historically used in stage splitters and snakes, cutting both weight and cost. As of 2026-10-10, new live-sound designs are advised to evaluate the TI DRV135UA as a higher-headroom alternative sourced from web_data cross-references, since the SSM2142 is moving to last-time-buy status.
Recommended
Audio Interface XLR Output Stage
USB and Thunderbolt audio interfaces that drive XLR outputs benefit from the SSM2142's small SOIC-16 footprint and clean differential output. The device accepts the single-ended DAC output and produces a low-distortion, ground-noise-immune differential pair to feed the XLR line driver stage, while the optional internal resistor network keeps component count low. Per the Analog Devices datasheet the SSM2142 supports the +4 dBu pro-audio standard without saturation on standard ±15 V supplies. In compact desktop interfaces where PCB area is at a premium, the SOIC-16 (SSM2142SZ) variant gives the same performance as the PDIP (SSM2142P) while fitting the smaller enclosure.
Recommended
Industrial Instrumentation Differential Line Driver
Beyond audio, the SSM2142's transformer-like balanced output is useful for transmitting low-frequency analog sensor signals over long cables in industrial plants where large ground potentials exist between the sensor and the controller. Driving 10 V RMS into 600 Ω differential loads with high common-mode rejection at the receiver end isolates the controller from ground loops and motor noise. The Analog Devices datasheet points to the SSM2142/SSM2141 pair as a complete, reliable solution for these applications. Designers should pick the SOIC-16 (SSM2142SZ) when the system sits on a surface-mount PCB and the PDIP variant (SSM2142P) when through-hole assembly or hand-prototyping is preferred.
Recommended
Differential Audio Distribution Amplifier
A distribution amplifier splits a single audio source to multiple destinations (recorders, monitors, broadcast feeds) while preserving ground isolation between them. The SSM2142's balanced drive and matched resistor network make it an excellent front-end for such an amplifier: the differential output transmits the audio cleanly to each SSM2141 receiver at every destination, providing 100 dB CMRR at 60 Hz per the Analog Devices datasheet. The 16-pin SOIC package keeps the BOM small and the PCB compact, which is critical in 1U rack units where multiple channels must fit side-by-side. With the SSM2142 family nearing EOL, designers can also choose the THAT 1646 or the DRV134UA as drop-in alternatives verified by the Alternatives Cross-Reference Data.
Recommended
Recommended Products Summary
Engineering reference data for SSM2142 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | DRV134UA | DRV135UA | THAT1646S08-U | THAT1606S08-U |
|---|---|---|---|---|---|
| Package | 16-pin SOIC (SSM2142SZ) / 16-pin PDIP (SSM2142P) | SOIC-16 | SOIC-16 | SOIC-16 | QSOP-16 (SOIC-compatible footprint) |
| Brand | Analog Devices | Texas Instruments | Texas Instruments | THAT Corporation | THAT Corporation |
| Function | Balanced audio line driver (single-ended to differential) | Balanced audio line driver | Balanced audio line driver (higher output) | Balanced audio line driver | Balanced audio line driver (differential input) |
| Differential Output Drive | 10 V RMS into 600 Ω | Comparable 600 Ω drive (better parameters per Electrokit) | Higher swing - up to +24 dBu class | Comparable 600 Ω drive (drop-in for DRV134/SSM2142) | Comparable 600 Ω drive with differential inputs |
| System CMRR with Companion Receiver | 100 dB at 60 Hz (with SSM2141) | High CMRR (paired with INA134/INA137) | High CMRR (paired with INA134/INA137) | High CMRR (paired with THAT 1200/INA134) | High CMRR (paired with THAT 1200/INA134) |
| Pin Compatibility with SSM2142 | — (target part) | Pin-compatible per TI/Analog cross reference | Pin-compatible per TI/Analog cross reference | Pin-compatible per THAT Corp datasheet | Pin-compatible per THAT Corp datasheet |
| Power Supply | Dual ±15 V typical | Dual ±15 V typical | Dual ±18 V typical (higher swing) | Dual ±15 V typical | Dual ±15 V typical |
| Lifecycle / Sourcing | Last-time-buy / EOL migration (Analog Devices) | Active (Texas Instruments) | Active (Texas Instruments) | Active (THAT Corporation) | Active (THAT Corporation) |
Key Differentiators
- Transformer-replacement architecture with matched internal thin-film resistors (vs DRV134UA)
- System-level 100 dB CMRR at 60 Hz with paired SSM2141 receiver (vs Generic op-amp line driver)
- Two compatible package options (SOIC-16 / PDIP-16) from same datasheet (vs Single-package competitors)
Design Notes
Use low-ESR 10 µF (or larger) decoupling capacitors on both V+ and V- within 5 mm of each supply pin, in parallel with 0.1 µF ceramic capacitors for high-frequency bypassing. The SSM2142's balanced output swing of 10 V RMS into 600 Ω requires a clean split supply; insufficient decoupling will couple supply ripple into the output pair and degrade system CMRR at the receiver.
Lay out the PCB so that the two differential output traces (OUT_A, OUT_B) are routed as a tightly-coupled pair with matched length and symmetric ground reference; any routing mismatch directly converts to common-mode error at the receiver. According to the Analog Devices datasheet application section, even a few millimeters of unmatched trace can measurably reduce the 100 dB CMRR figure the SSM2142/SSM2141 system is specified for.
New designs should NOT use the SSM2142 as a default choice in 2026 because Analog Devices is migrating the part toward last-time-buy/EOL per EngineerZone Q&A 165838. Verified Alternatives Cross-Reference Data confirms the TI DRV134/DRV135 family and the THAT 1646/1606 family are pin-compatible drop-in replacements with active sourcing; planning the swap now avoids an end-of-life BOM surprise.
When driving long cables (>10 m), terminate the line with a 600 Ω differential resistor at the receiver input to maintain the matched-impedance environment. Mismatched terminations cause standing waves and frequency-response ripple; the SSM2142's low-impedance balanced output is designed to drive precisely this 600 Ω differential load as documented in the Analog Devices datasheet.
Compliance Information
RoHS / lead-free compliance extracted from DigiKey listing (654308, SSM2142SZ) and the Analog Devices product page. Halogen-free status and conflict-mineral reporting not present in the verified web data - marked 'unknown' per Data Authenticity Rule #10. SSM2142P (PDIP) lot-dependent compliance should be verified against the manufacturer C of C.
